As you know that facebook is the biggest social media of the world where you can easily get traffic for your blog and website we know the importance of  facebook therefore today i,ll share you the methode of  adding facebook comment box for blogger
1) First of all go to your blogger dashboard click on template and then edit html

2) Use Ctrl+F and find <data:post.body/>
3) copy given codes and paste these codes after it <data:post.body/>

<H2>Please Leave a Comment</H2>< br /><br />

<div class="fb-comments" data-href="Your BLOG URL" data-numposts="Number of Comment to show" data-width="600"></div>

4) Add your blog URL  
5) Finally click on save and your setting have been done